Ahmed al-Alwani, a member of the Sunni community, had backed protests against the mainly Shia government of PM Nouri al-Maliki and was reportedly wanted on terrorism charges.
Police said Ahmed al-Alwani’s guards opened fire as officers arrived to detain him.
Another 18 people were wounded in the ensuing skirmish, an official said.
“Security forces attacked the residence of MP Ahmed al-Alwani in central Ramadi to arrest him this morning, sparking a battle with his guards with automatic weapons and rocket-propelled grenades,” a police major told AFP news agency.
“Five of Alwani’s guards and his brother were killed and eight others wounded, while 10 security forces members were also wounded,” the major said.
Some reports suggest that a sister of the MP – a member of the Sunni-backed Iraqiya bloc – was also among those killed in the raid.
The reasons for Ahmed al-Alwani’s arrest were not immediately clear. Associated Press news agency said he was wanted on terrorism charges.
He has also been a prominent supporter of a group of activists camped on a highway near Ramadi protesting against the perceived marginalization and persecution of Iraqi Sunnis by the Shia-dominated government.
PM Nouri al-Maliki has reportedly threatened to shut down the camp, saying it has become a headquarters of al-Qaeda.
Ahmed al-Alwani’s arrest comes as Iraq remains in the grip of sectarian fighting which has made this the deadliest year since 2008.
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